An unknown solution could contain any or all of the

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: tory, your TA will provide you with a blank "flow chart." Record the correct answers here while you do the on-line exercise and bring these answers to lab class with you. Question 1. An unknown solution could contain any or all of the following cation: K+, Ca2+, Cr3+, Mn2+, Fe3+, Co2+, Zn2+. A 1 mL portion of the unknown is treated with 2 mL of 6 M NaOH, added a few drops at a time with shaking. Immediately thereafter 10 drops of 3% hydrogen peroxide are added dropwise with shaking, and the centrifuge tube is then heated for a few minutes in a water bath until bubbling ceases. The resulting conglomerate is then centrifuged and the supernatant liquid is decanted off and saved. (Although you have not demonstrated these facts for yourself, Ca2+ will be precipitated as the hydroxide at this stage and K+ will remain in the decanted liquid.) At this stage of the experiment the elements that could be found in the decanted liquid are: _____ ______ ______ _______ _______ _______ _______ _______ _______ 34 The elements that could be found in the remaining precipitate are: _____ ______ ______ _______ _______ _____...
View Full Document

This note was uploaded on 04/09/2013 for the course CHE CHE 2C taught by Professor Nasiri during the Spring '07 term at UC Davis.

Ask a homework question - tutors are online